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Class Information
Number: 250/202
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controls its own optical systems > Following a pattern (e.g., line or edge)
Description: Subject matter having means for illuminating the photocell in accordance with the relative position of the photocell and a pattern, and having means for causing the photocell to follow the edge of the pattern under control of said illumination, or for causing the optical path between pattern and photocell to change, under the control of said illumination, so that the photocell follows the edge of the pattern image.

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8592766 Display device and light sensing system Nov. 26, 2013
8515291 Light receiving device and light receiving method Aug. 20, 2013
8283617 Display device and light sensing system Oct. 9, 2012
8259546 Optical disc device, tracking control start method, and tracking control start program Sep. 4, 2012
8188431 Integration of vacuum microelectronic device with integrated circuit May. 29, 2012
7800089 Optical sensor for a printer Sep. 21, 2010
7295292 Methods and systems for measuring an aberated wave front Nov. 13, 2007
6920249 Method and measuring instrument for determining the position of an edge of a pattern element on a substrate Jul. 19, 2005
6815702 Method and apparatus for detection of an edge of a printing plate mounted on a drum imaging system Nov. 9, 2004
6596987 Methods and systems for monitoring combustion condition Jul. 22, 2003
6591155 Methods and apparatus for calculating alignment of layers during semiconductor processing Jul. 8, 2003
6543972 Device to help determine key cut attributes Apr. 8, 2003
6338013 Multifunctional mobile appliance Jan. 8, 2002
6338015 Steering control system for vehicle Jan. 8, 2002
6220158 Rotation-angle measurement for printing presses Apr. 24, 2001
6065911 Method and apparatus for automatically making keys May. 23, 2000
5974347 Automated lawn mower Oct. 26, 1999
5908273 Key duplication apparatus and method Jun. 1, 1999
5869945 Infrared scanner Feb. 9, 1999
5864145 Optical tracing system for measuring elevation of a reference body above a reference surface Jan. 26, 1999
5807042 Method and apparatus for automatically making keys Sep. 15, 1998
5646723 Combined earth sensor Jul. 8, 1997
5373150 Line tracing method and apparatus therefor Dec. 13, 1994
5357096 Line tracing method and line tracing apparatus Oct. 18, 1994
5350912 System for controlling movement of a mobile body along a target path Sep. 27, 1994
5351309 Image edge sensor Sep. 27, 1994
5319186 Apparatus for controlling the movement of a tool along the edge of glass panes Jun. 7, 1994
5262797 Monitoring and controlling quality of pen markings on plotting media Nov. 16, 1993
5243265 Non-contact tracing control apparatus Sep. 7, 1993
5225827 Warning device in a motor vehicle for detection of unintentional change of course Jul. 6, 1993
5210399 Optical probe head with mounting means providing a free recalibration of the sensing head after a collision May. 11, 1993
5173598 Optical scanning beam position control system which is free of modulation by tracking error Dec. 22, 1992
5170047 Optical sensor for plotter pen verification Dec. 8, 1992
5144130 Method for the electrical adjustment of an optical row of sensors Sep. 1, 1992
5144131 Device for optically scanning an information plane detecting border portions of light beam Sep. 1, 1992
5130523 Coordinate measuring machine with improved flexure and clamp for fiber optic connection Jul. 14, 1992
5128531 Optical profile reader, particularly for key duplicating machine Jul. 7, 1992
5079543 Monitoring device for at least one current pickup of a conveyor truck in a conveyor system running on tracks Jan. 7, 1992
5066854 Method of and apparatus for guiding a self-steering vehicle along an optical guideway Nov. 19, 1991
5041722 Method of guiding movement of unmanned vehicle by following a number of luminous points Aug. 20, 1991
5013901 Tracking control method for eliminating a tracking error due to a movement of an objective lens May. 7, 1991
4988200 Apparatus for automatic tracking and contour measurement Jan. 29, 1991
4985847 Visual sensor system Jan. 15, 1991
4944826 Method and apparatus for preparing a screen printing screen Jul. 31, 1990
4937593 Print head position control system Jun. 26, 1990
4933541 Method and apparatus for active vision image enhancement with wavelength matching Jun. 12, 1990
4924455 Apparatus for generating tracking error signals in a differential phase detection system May. 8, 1990
4888478 Line tracer improved corner circuit with speed varying sampling Dec. 19, 1989
4884224 Method for generating image contour data and apparatus therefor Nov. 28, 1989
4872105 Curve following apparatus Oct. 3, 1989

1 2 3 4 5 6

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